Multiplier : 16 - Fb242 - - Siemens SIMATIC S5-100U System Manual

S5-100U
9.2.3

Multiplier : 16 - FB242 -

Use function block FB 242 to multiply one fixed-point binary number (16 bits) by another
duct is represented by two fixed-point binary numbers (16 bits each)
zero. An eight-bit number must be transferred to a 16-bit word prior to multiplication.
Table 9-4. Call and Parameter Assignments of FB242
Parameter
Z1
Z2 Multiplicand
Z3=0 Scan for zero
Z32 Product high-word
Z31 Product low-word
9.2.4 Divider : 16
Use function block FB 243 to divide one fixed-point binary number (16 bits) by another
(quotient and remainder) is represented by two fixed-point binary numbers (16 bits each).
The divisor and the result are also scanned for zero
16-bit word prior to division.
Table 9-5. Call and Parameter Assignments of FB243
Parameter Explanation
Z1
Z2
OV Overflow bit
FEH
Z3=0 Scan for zero
Z4=0 Scan for zero
Z3
Z4 Remainder
EWA 4NEB 812 6120-02b
Meaning Type
Multiplier W
I
W
I
Q BI
Q W
Q W
- FB243 -
Type
Dividend I W
Divisor I W
Q BI
Q BI
Q BI
Q BI
Quotient Q W
Q W
Integrated Blocks and Their Functions
.
The result is also scanned for
Assignment
-32768 to+32767
-32768 to+32767
"0" : product is zero
16 Bits
16 Bits
.
An eight-bit number must be transferred to a
Assignment
-32768 to+32767
-32768 to+32767
"1" : overflow
"1" : division by zero
"0": quotient is zero
"0": remainder is zero
16 bits
16 bits
.
The pro-
STL
: JU FB242
NAME : MUL:16
Z1 :
Z2 :
Z3=0 :
Z32 :
Z31 :
.
The result
STL
: JU FB243
NAME : DIV:16
Z1 :
Z2 :
OV :
FEH :
Z3=0 :
Z4=0 :
Z3 :
Z4 :
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